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United States Patent | 5,674,794 |
Chatterjee ,   et al. | October 7, 1997 |
A method for preparing a ceramic article comprising compacting a particulate alloy of a primary oxide and a secondary oxide to form a blank, and sintering the blank in contact with substantially pure zirconium oxide. The primary oxide is zirconium oxide and the secondary oxide is selected from the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, rare earth oxides and combinations thereof. Ceramic articles produced have tetragonal phase cores and monoclinic cases.
Inventors: | Chatterjee; Dilip Kumar (Rochester, NY); Ghosh; Syamal K. (Rochester, NY); Majumdar; Debasis (Rochester, NY) |
Assignee: | Eastman Kodak Company (Rochester, NY) |
Appl. No.: | 506629 |
Filed: | July 25, 1995 |
Current U.S. Class: | 264/658; 264/667; 264/681; 501/104 |
Intern'l Class: | C04B 035/488 |
Field of Search: | 501/103,104 264/65 |
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TABLE 1 ______________________________________ COMPARATIVE EXAMPLES X-RAY DIFFRACTION SCANS FROM 2 THETA = 20-40 DEGREES, Cu K ALPHA Peaks observed at 2 theta degrees: 34.7 35.2-3 Scanning 28.2 30.3-5 31.5 T(0002) T(200) Com- # Angle M(-111) T(111) M(111) C(200) ments ______________________________________ 1 glancing absent very absent strong strong strong absent Interpretation: tetragonal phase 1 coupled absent very absent strong strong strong absent Interpretation: tetragonal phase 2 glancing weak very weak strong strong strong absent Interpretation: tetragonal phase predominant monoclinic phase at minor level (1-10%) 3 glancing absent very absent weak weak strong strong Interpretation: cubic phase predominant tetragonal phase at minor level (1-10%) 3 coupled absent very absent strong strong strong absent Interpretation: tetragonal phase 4 glancing absent very absent weak weak strong strong Interpretation: cubic phase predominant tetragonal phase at minor level (1-10%) 5 glancing weak very weak absent absent strong strong Interpretation: cubic phase predominant monoclinic phase at minor level (1-10%) ______________________________________